Document 6575284

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Reference Design RD-326
Fairchild Power Switch (FPSTM) FSFA2100 - 300W Design
Featured Device Application
FSFA2100
FFPF20UP20DN
RURG1520CC
LCD TV
Input Voltage
Range
Output Voltage
(Rated Current)
Rated Output
Power
Topology
340~400VDC
24V (12.5A)
300W
Asymmetric PWM
Half-Bridge Converter
Key Features
FSFA2100
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
ƒ
Optimized for Complementary Driven Half-Bridge Soft-Switching Converters
Internal SuperFET™s with Fast Recovery Type Body Diode: trr=120ns
Fixed Dead Time: 200ns
Up to 300kHz Operating Frequency
Internal Soft-Start
Burst-Mode Operation for Low Standby Power Consumption
Various Protection Functions: Over-Voltage Protection (OVP), Overload Protection (OLP), Abnormal
Over-Current Protection (AOCP), Internal Thermal Shutdown (TSD), and Pulse-by-Pulse Current Limit
FFPF20UP20DN
ƒ
ƒ
100V/20A Ultra-Fast Recovery Rectifier, Common Cathode
Low Forward-Voltage Drop: 1.15V at TA = 25oC, 10A
RUGR1520CC
ƒ
ƒ
200V/15A Ultra-Fast Diode, Common Cathode
Low Forward-Voltage Drop: 1.05V at TA = 25oC, 15A
1. Schematic
Figure 1.
© 2009 Fairchild Semiconductor Corporation
Schematic
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RD-326_FSFA2100 • Rev. 0.0.1
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2. Transformer
Figure 2.
Transformer Schematic Diagram
2.1. Winding Specification
Pin (S → F)
Wire
Turns
Winding Method
Np
8→1
0.08φ×88 (Litz Wire)
23
Section Winding
Ns1
9 → 13
0.08φ×574 (Litz Wire)
4
Section Winding
Ns2
16 → 10
0.08φ×574 (Litz Wire)
4
Section Winding
Core: EER4042 (Ae=158 mm2)
Bobbin: EER4042 (Horizontal, 16 pins, 8/8 pins at each side)
2.2. Electrical Characteristics
Pin
Specification
Remark
Primary-Side Inductance (Lm)
1－8
400μH ± 10%
100kHz, 1V
Primary-Side Effective Leakage
Iinductance (Llk)
1－8
18μH± 10%
100kHz, 1V
Short All of the Secondary Windings
© 2009 Fairchild Semiconductor Corporation
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RD-326_FSFA2100 • Rev. 0.0.1
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3. Typical Characteristics
94
93
Eff [%]
92
91
90
89
88
87
1.25
2.5
3.75
5
6.25
7.5
8.75
10
11.25
12.5
Load [A]
Figure 3.
Efficiency
Related Resources
FSFA2100 — Fairchild Power Switch (FPS™) for Half-Bridge PWM Converters
AN-4153 — Designing Asymmetric PWM Half-Bridge Converters with a Current Doubler and
Synchronous Rectifier Using FSFA-Series Fairchild Power Switches (FPS™)
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© 2009 Fairchild Semiconductor Corporation
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RD-326_FSFA2100 • Rev. 0.0.1